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Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
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Crystal Field Theory
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Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
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Hexagonal Perovskites as Quantum Materials.

Loi T Nguyen1, R J Cava1

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Summary
This summary is machine-generated.

Hexagonal oxide perovskites offer unique structures with face-sharing octahedra, impacting magnetic properties. These materials are promising for discovering new quantum materials, including those exhibiting quantum-spin-liquid states.

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Area of Science:

  • Solid State Chemistry
  • Materials Physics
  • Quantum Materials

Background:

  • Hexagonal perovskites differ from common perovskites by featuring face-sharing metal-oxygen octahedra or trigonal prisms.
  • This structural characteristic leads to shorter metal-metal distances and reduced metal-oxygen-metal bond angles.

Purpose of the Study:

  • To review the solid state chemistry of hexagonal oxide perovskites.
  • To highlight their potential as quantum materials due to unique structural and magnetic properties.

Main Methods:

  • Review of existing literature on hexagonal oxide perovskites.
  • Analysis of structural features, specifically face-sharing octahedra.
  • Discussion of magnetic properties and potential for quantum phenomena.

Main Results:

  • Face-sharing octahedra create dimers, trimers, or chains, significantly influencing magnetic behavior.
  • Hexagonal perovskites exhibit geometrical frustration, relevant for magnetic ordering and orbital occupancy.
  • Several hexagonal oxide perovskites are identified as candidates for the quantum-spin-liquid state.

Conclusions:

  • Hexagonal oxide perovskites are a rich area for discovering novel quantum materials.
  • Their unique structures provide a foundation for exploring advanced magnetic phenomena.
  • Further research into these materials is crucial for advancing quantum materials science.